Hello, unfortunately I have this problem too, it constantly uses 30% of the processor when idle, I tried everything, but the problem is completely related to the new indesign versions. Adobe has not made a fix on this issue yet, when will you fix it, Adobe?

I never experienced this problem in old versions. This problem is valid for 2021-2022-2023-2024 versions.

I tested by installing all Indesign versions on my computer and found that the only problematic versions were versions 2021 and above.

From the attached images, you can see the CPU usage of the 2020 version and the 2021 version. 2020 has no problems, but the 2021 version uses high processor idle.